Difference between revisions of "User:Morgan525"

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I'm also known as "Tycho" on StrategyCore forums. I've been learning about disassembly and C++ coding since December of 2011 because I wanted to mod the tank/cannon of Enemy Unknown into a chaingun. I started playing with DOSbox but switched to the CE version and began focusing on its sound problems. I have tinkered with Seb76's UFOloader, added those fixes of my own, and rearranged Seb's INI file to make it less overwhelming to new users. I started helping Kyrub in his quest to convert UFOextender into one for Terror From the Deep but eventually became the main person doing it. You can find it here, as well as the original [[:file:UFOLoader.zip|UFOextender]]. Don't forget to check out the [[User:Seb76|UFO Extender's Information Page]].
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I'm also known as "Tycho" on StrategyCore forums. I've been studying disassembly and C++ coding since December of 2011. This all started because I wanted to mod the tank/cannon of '94 Enemy Unknown into a tank/chaingun for my own games. I started playing the DOS version but eventually switched to the CE version. At first, I focused on the sound problems which is when I started to experiment with Seb76's UFOloader.  
  
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==[[TFTDextender|TFTD Extender]]==
+
==[[UFOextender|UFO Extender]]==
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This is the conversion of Seb76's UFOloader for Terror from the Deep. It adds a lot of functionality and fixes to the Collector's Edition (MS Windows version) of ''Terror from the Deep''. I've kept to Seb's idea that the Extender won't do simple data modifications, except in rare circumstances where the data in the original game was incorrect or a fix makes the original values unplayable, but I'll always include the option to not apply these data changes. The intent is that the Extender can be used along with any data modifications that a player might want to use.
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This is the original program created by [[user:seb76|Seb76]] for use with ''Enemy Unknown''. Check out the [[UFOextender|UFO Extender's Information Page]]. You can download the latest version and patches here:  [[:file:UFOLoader.zip|UFO Extender]].
  
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Do not hesitate to report any problem you encounter with it, I'll try to help you fix it.
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If you're interested in the source code, it is available. Be warned you'll need to decompile the executable and be familiar with disassembly terminology to understand a lot of what the Extender does, since it inserts new lines into preexisting code. The source files for the Extender are here: [[Image:UFOExtender-src.zip]].
  
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==Modding the Tank/Cannon into a Tank/Chaingun==
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==[[TFTDextender|TFTD Extender]]==
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It adds a lot of functionality and fixes to the Collector's Edition (MS Windows version) of ''Terror from the Deep''. Click on the title to get to the information page.
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Many people have questions about this.  It's fairly easy to change the ammo type of the Tank/Cannon turrent and damage into a AP/rifle and then giving the turret autofire. The real problem is changing the amount of ammo in the tank and not cause problems with the amount of ammo in your base stores.  In the executable there are various places that handle updating the amount of ammo for the various events: adding a tank onto a craft(checking if the base has the proper amount of ammo for the tank and removing that amount from base stores, if so), removing the tank from a craft (adding the ammo back to base stores), post-tactical (adding the remaining ammo from the tank into base stores and attempting to add the tank back onto the craft), and post base-defense (adding the remaining ammo to base stores.) In addition, there is the line that sets the amount of ammo for the tank in unitref.dat.  If you miss any of these areas, your ammo supply quickly spirals out of control or you get no benefit for the changes you have made.
 
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The DOS version of the game makes it much simpler to adjust the stats, but I have lost the notes on the offsets.  The problem with the CE version is the way the compiler wrote the calculations. In the code, the value was calculated by using multiples of five with bit-shifts to get to 30.  This means you can't choose any amount for your ammo.  I rewrote these lines to make it simpler to understand and give more freedom to choose the value(Feel free to use these changes. I gave my tank 60 rounds {3Ch}. However, unless you want to deduce for yourself how to modify the proper locations, don't increase the amount of ammo over 63. [This has to do with how the game uses bit-shifts to calculate remaining ammo during the post-tatical phase]):
 
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<nowiki>TANK/CANNON AMMO ALTERATION
 
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POST-TACTICAL PHASE BASE/CRAFT INVENTORY UPDATE
 
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0x449C53: B8 3C 00 00 00 0F AF C2 90 90 3B F0 7D 2C 66 0F B6 D2 66 01 17 B8 89 88 88 88 F7 EE 03 D6 C7 44 24 10 01 00 00 00 C1 FA 05 8B C2 C1 E8 1F 03 D0 88 55 2C 66 0F B6
 
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          D2 66 29 17 66 0F B6 45 00 8B D0 C1 E2 0B 2B D0 C1 E2 04 03 D0 C1 E2 02 66 02 91 1A 01 00 00 90 90
 
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.text:00449C53                mov    eax, 3Ch
 
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.text:00449C58                imul    eax, edx
 
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.text:00449C5B                nop
 
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.text:00449C5C                nop
 
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.text:00449C5D                cmp    esi, eax
 
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.text:00449C5F                jge    short loc_449C8D
 
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.text:00449C61                movzx  dx, dl
 
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.text:00449C65                add    [edi], dx
 
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.text:00449C68                mov    eax, 88888889h
 
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.text:00449C6D                imul    esi
 
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.text:00449C6F                add    edx, esi
 
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.text:00449C71                mov    [esp+30h+var_20], 1
 
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.text:00449C79                sar    edx, 5
 
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.text:00449C7C                mov    eax, edx
 
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.text:00449C7E                shr    eax, 1Fh
 
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.text:00449C81                add    edx, eax
 
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.text:00449C83                mov    [ebp+2Ch], dl
 
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.text:00449C86                movzx  dx, dl
 
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.text:00449C8A                sub    [edi], dx
 
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.text:00449C8D                movzx  ax, byte ptr [ebp+0]
 
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.text:00449C92                mov    edx, eax
 
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.text:00449C94                shl    edx, 0Bh
 
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.text:00449C97                sub    edx, eax
 
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.text:00449C99                shl    edx, 4
 
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.text:00449C9C                add    edx, eax
 
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.text:00449C9E                shl    edx, 2
 
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.text:00449CA1                db      66h
 
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.text:00449CA1                add    dl, [ecx+11Ah]
 
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.text:00449CA8                nop
 
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.text:00449CA9                nop
 
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0x449DFA: B8 3C 00 00 00 0F AF C2 3B F0 7D 2E 90 90 66 0F B6 D2 66 01 17 B8 89 88 88 88 F7 EE 03 D6 C7 44 24 10 01 00 00 00 C1 FA 05 8B C2 C1 E8 1F 03 D0 88 55 00 66 0F B6
 
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          D2 66 29 17 66 0F B6 45 00 8B D0 C1 E2 0B 2B D0 C1 E2 04 03 D0 C1 E2 02 66 01 91 1A 01 00 00 90 90
 
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.text:00449DFA                mov    eax, 3Ch
 
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.text:00449DFF                imul    eax, edx
 
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.text:00449E02                cmp    esi, eax
 
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.text:00449E04                jge    short loc_449E34
 
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.text:00449E06                nop
 
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.text:00449E07                nop
 
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.text:00449E08                movzx  dx, dl
 
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.text:00449E0C                add    [edi], dx
 
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.text:00449E0F                mov    eax, 88888889h
 
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.text:00449E14                imul    esi
 
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.text:00449E16                add    edx, esi
 
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.text:00449E18                mov    [esp+30h+var_20], 1
 
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.text:00449E20                sar    edx, 5
 
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.text:00449E23                mov    eax, edx
 
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.text:00449E25                shr    eax, 1Fh
 
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.text:00449E28                add    edx, eax
 
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.text:00449E2A                mov    [ebp+0], dl
 
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.text:00449E2D                movzx  dx, dl
 
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.text:00449E31                sub    [edi], dx
 
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.text:00449E34                movzx  ax, byte ptr [ebp+0]
 
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.text:00449E39                mov    edx, eax
 
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.text:00449E3B                shl    edx, 0Bh
 
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.text:00449E3E                sub    edx, eax
 
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.text:00449E40                shl    edx, 4
 
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.text:00449E43                add    edx, eax
 
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.text:00449E45                shl    edx, 2
 
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.text:00449E48                add    [ecx+11Ah], dx
 
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.text:00449E4F                nop
 
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.text:00449E50                nop
 
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[TANK/CHAINGUN AMMO AMOUNT SET WHEN GEOSCAPE UPDATES UNITREF.DAT FOR NEXT BATTLE]
 
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0x44ED27: C6 45 76 3C
 
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.text:0044ED27                mov    byte ptr [ebp+76h], 3Ch
 
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[TANK/CHAINGUN AMMO CHECK IN BASE INVENTORY AND ALTERATION OF AMOUNT]
 
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0x456410: 66 83 84 90 1A 01 00 00  3C
 
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.text:00456410                add    word ptr [eax+edx*4+11Ah], 3Ch
 
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0x4564F1: 66 83 F9 3C
 
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.text:004564F1                cmp    cx, 3Ch
 
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0x456512: 83 C1 C4
 
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.text:00456512                add    ecx, 0FFFFFFC4h  (add    ecx, -3Ch)
 
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[Alternate option]
 
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0x456512: 83 E9 3C
 
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.text:00456512                sub    ecx, 3Ch             
 
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TANK STATS start at offset 47573B
 
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TANK UFOpaedia info 4752B0~4752CF
 
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</nowiki>
 
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==Comparison of Damage routines==
 
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[[File:xcraft-dam-routine.GIF]]
 
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To explain, first the memory address of the Xcraft weapon is loaded to eax. Then the damage value is read from (eax+6) and loaded into bx.  This value is sent to the random function where the value generated is returned through eax. Thereafter, the base value (ebx) is added to the random value (eax) for a range of 100-200%. The value of eax has edx subtracted from it (after extensive testing of several encounters and having edx displayed for each attack, edx always seems to be 0). eax is bit-shifted 1 space to the right {divided by two} and the final amount added to the amount of damage the craft has sustained (edi+0Ah).  The result is that Xcraft weapons do 50-100% damage.
 
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[[File:UFO-dam-routine.GIF]]
 
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In the UFO case: the memory location for the UFO stats are set in ecx. Then the UFO weapon power is read (ecx+16h) and put into dx. Then this value is sent to the random funtion and again returned through eax (or ax as is the case here).  ecx is set to zero and the random value is checked to see if zero was generated [cmp(compare) ax, cx]. If this is true, the program jumps past the section to assign damage to the Xcraft.
 
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*The main routine for interdiction in DOS1.4 version is from 330B0~336A8.
 
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==Table of Battlescape sound calls==
 
−
The following is a list of how most events in TACTICAL generate sounds.  This data is scattered throughout the executable in various data arrays.  First an event number is passed to the sound subroutine. The program then compares the event with its corresponding entry in another section to determine how to play that sound. 06 is the standard method. 01 plays the sound uninterrupted by other sounds.
 
−
 
 
−
<nowiki>
 
−
Play CAT
 
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Evt# Setting reference          Description
 
−
00 00 -- Normal bipedal movement.  Routine refers to tileset and alternates between 1 and 2.
 
−
01 01 0E normal tank move
 
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02 01 00 snakeman move
 
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03 02 --
 
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04 01 0F Flying unit move
 
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05 01 10 Celatid move
 
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06 01 2F Silacoid move
 
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07 02 --
 
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08 02 --
 
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09 02 --
 
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0A 01 28 hovertank/cyberdisk move
 
−
0B 06 04 rifle/pistol shoot
 
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0C 06 16 bullet hit
 
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0D 03 14 sliding door opens. Routine randomly plays 1 of the 2 entries in SAMPLE2.
 
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0E 06 03 normal door opens
 
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0F 02 --
 
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10 06 0C big gun shoots
 
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11 06 0D big gun hits
 
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12 06 0B laser gun shoots
 
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13 06 13 laser shot hits
 
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14 06 12 plasma gun shoots
 
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15 06 13 plasma shot hits
 
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16 06 34 rocket launches
 
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17 06 35 blaster bomb/stun launcher shoots
 
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18 06 0C small explosion (problem: zombie move)
 
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19 06 05 big explosion
 
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1A 02 -- stun rod  (*problem*)
 
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1B 06 24 psi attack
 
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1C 06 06 mind probe use*
 
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1D 06 11 reload weapon
 
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1E 06 26 place an item
 
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1F 02 --
 
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20 04 -- death of a male. Routine randomly plays 1 of the 3 sounds in SAMPLE2.
 
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21 06 17 tank destroyed
 
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22 06 0A sectoid death
 
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23 06 08 snakeman death
 
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24 06 09 etheral death
 
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25 06 06 muton death
 
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26 06 0A floater death
 
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27 06 07 celatid death
 
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28 06 08 silacoid death
 
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29 06 09 chryssalid death
 
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2A 06 0A reaper death
 
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2B 06 17 sectopod death
 
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2C 06 17 cyberdisk death
 
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2D 06 30 zombie & reaper attack
 
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2E 06 31 chryssalid attack
 
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2F 06 32 silacoid attack
 
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30 06 30 celatid attack
 
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31 06 27 throw an item
 
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32 05 -- death of a female. Routine randomly plays 1 of the 3 sounds in SAMPLE2.
 
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33 02 --
 
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34 02
 
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35 02
 
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36 02
 
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37 02
 
−
</nowiki>
 
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==Other Random Sound Information==
 
−
<nowiki>
 
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406100-subroutine for melee attacks
 
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406110- set default melee sound event to 1A
 
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(4067C8)data base of melee attacks
 
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value offset sound event #
 
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00 461B2 2F
 
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01 461BC 2E
 
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02 461C6 2D
 
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03 461E7 skip
 
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04 461E7 skip
 
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05 461E7 skip
 
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06 461E7 skip
 
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07 461C6 2D
 
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Reference points for unit movement sound event IDs. [this word referenced]
 
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.data:0046D1A0  00 00  00 00  01 00  01 00  00 00  00 00 [00 00] 00 00 
 
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.data:0046D1B0  [00 00] 00 00 [00 00] 00 00  [01 00] 01 00 [00 00] 00 00 
 
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.data:0046D1C0  [02 00] 01 00 [00 00] 00 00  [00 00] 00 00 [04 00] 01 00 
 
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.data:0046D1D0  [05 00] 01 00 [06 00] 01 00  [00 00] 00 00 [00 00] 00 00 
 
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.data:0046D1E0  [00 00] 00 00 [0A 00] 01 00  [00 00] 00 00 [00 00] 00 00 
 
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.data:0046D1F0  [18 00] 01 00  01 00  00 00  01 00  0B 00  0C 00  01 00
 
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data set for death scream per unit.
 
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0.data:0046B644 word_46B644    dw  20h                  ; DATA XREF: sub_40E450+55�r
 
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1.data:0046B646                db  20h
 
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2.data:0046B648                db  20h
 
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3.data:0046B64A                db  21h
 
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4.data:0046B64C                db  22h
 
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5.data:0046B64E                db  23h
 
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6.data:0046B650                db  24h
 
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7.data:0046B652                db  25h
 
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8.data:0046B654                db  26h
 
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9.data:0046B656                db  27h
 
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A.data:0046B658                db  28h
 
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B.data:0046B65A                db  29h
 
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C.data:0046B65C                db  2Ah
 
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D.data:0046B65E                db  2Bh
 
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E.data:0046B660                db  2Ch
 
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F.data:0046B662                db  20h
 
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10.data:0046B664                db  32h
 
−
11.data:0046B666                db  20h
 
−
 
 
−
 
 
−
SUBROUTINE              USED FOR
 
−
 
 
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404650+1AE PSI ATTACK EFX
 
−
406100+4F9 TERRORIST MELEE ATTACK EFX
 
−
40B420+111 EXPLOSION EFX
 
−
40B420+24F EXPLOSION EFX?
 
−
40E450+73 DEATH SCREAM EFX
 
−
40F2C0+285 PLACE ITEM EFX
 
−
4110E0+E0 ITEM USE EFX
 
−
4110E0+901 SHOT HIT EFX
 
−
419660+1A5 PLACE ITEM (INVENTORY) EFX
 
−
419660+346 RELOAD EFX
 
−
41DCC0+D1 STUN ROD ATTACK EFX
 
−
41EE10+8C PSI ATTACK EFX
 
−
41F0F0+8C PSI ATTACK EFX
 
−
41FD10+8B MIND PROBE EFX
 
−
421140+13 DOORS EFX
 
−
4247D0+27A NON-WALK MOVE EFX
 
−
4247D0+4D4 WALK MOVE EFX
 
−
42A630+B7 GMTATICS.MID
 
−
42A6F0+18 GMLOSE.MID
 
−
42B6F0+E9 GMWIN.MID
 
−
43D8C0+E GEOSCAPE OPEN WINDOW EFX
 
−
4407D0+2E ?
 
−
4407D0+9C GMGEOx.MID
 
−
445B00+BC GMINTER.MID
 
−
4467C0+1C1 X-COM CRAFT LEFT WEAPON EFX
 
−
4467C0+233 X-COM CRAFT RIGHT WEAPON EFX
 
−
446DA0+267 UFO HIT EFX
 
−
4470B0+F2 UNKNOWN INTERCEPTION EVENT (CRAFT CRASH EFX?)
 
−
447EE0+32 GMSTORY.MID
 
−
448390+28F ??
 
−
448390+2DD BASE DEFENSE (EVENT 9)
 
−
448390+3DC ?0A (BASE DEFENSE?)
 
−
448390+3F1 ?0A
 
−
448390+406 ?0A
 
−
44A220+15 GMSTORY.MID
 
−
44C940+10 GMDEFEND.MID
 
−
44CD40+26 GMBASE.MID
 
−
44D030+D GMDEFEND.MID
 
−
44D3C0+E GMMARS.MID
 
−
44D690+10 GMMARS.MID
 
−
44DACO+10 GMBASE.MID
 
−
450F10+91 BLEEP (1)
 
−
45DCA0+17 ??
 
−
</nowiki>
 
−
 
 
−
==Functions used in UFOextender's new interception routines==
 
−
For those that might want to know how accuracy is calculated with the new options for interception turned on:
 
−
 
 
−
X-Craft Accuracy
 
−
 
 
−
[(1+((3-(.5*(difficulty level-1)))/UFOsize)/2 ] * Weapon Accuracy .......        [beginner=1..superhuman=5]
 
−
<nowiki>Diff 　　　　　　Ship Sizes
 
−
VS S M L VL
 
−
begin  0.8 0.875 1 1.25 2
 
−
exp 0.75 0.8125 0.91667 1.125 1.75
 
−
vet 0.7 0.75 0.83333 1 1.5
 
−
Genius　 0.65 0.6875 0.75 0.875 1.25
 
−
Super 0.6 0.625 0.66667 0.75 1</nowiki>
 
−
         
 
−
 
 
−
UFO Accuracy
 
  
−
60 + ((difficulty level-1)*3) - [Cautious Mode bonus (10)]
+
For those interested, here is the [[:File:TFTDextender-src.zip| source code]] for the Extender.
  
−
==Other Information==
+
==Other information==

Latest revision as of 15:00, 22 February 2016

I'm also known as "Tycho" on StrategyCore forums. I've been studying disassembly and C++ coding since December of 2011. This all started because I wanted to mod the tank/cannon of '94 Enemy Unknown into a tank/chaingun for my own games. I started playing the DOS version but eventually switched to the CE version. At first, I focused on the sound problems which is when I started to experiment with Seb76's UFOloader.

UFO Extender

This is the original program created by Seb76 for use with Enemy Unknown. Check out the UFO Extender's Information Page. You can download the latest version and patches here: UFO Extender.

If you're interested in the source code, it is available. Be warned you'll need to decompile the executable and be familiar with disassembly terminology to understand a lot of what the Extender does, since it inserts new lines into preexisting code. The source files for the Extender are here: File:UFOExtender-src.zip.

TFTD Extender

It adds a lot of functionality and fixes to the Collector's Edition (MS Windows version) of Terror from the Deep. Click on the title to get to the information page.

For those interested, here is the source code for the Extender.

Other information

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